Recessed control knob



FIG. 1 is a front isometric view of a recessed control knob of the present invention, showing my new design;

FIG. 2 is rear isometric view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a cross-sectional view thereof along line 4—4 of FIG. 3.

The broken line showing on the drawing disclosure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a recessed control knob, as shown. 